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https://github.com/pygos/init.git
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94 lines
2 KiB
C
94 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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* Copyright (C) 2018 - David Oberhollenzer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include "libcfg.h"
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static int xdigit(int x)
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{
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if (isupper(x))
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return x - 'A' + 0x0A;
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if (islower(x))
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return x - 'a' + 0x0A;
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return x - '0';
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}
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int unescape(char *src)
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{
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char *dst = src;
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int c;
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for (;;) {
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while (*src != '"' && *src != '\0')
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*(dst++) = *(src++);
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if (*src == '\0')
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break;
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++src;
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while ((c = *(src++)) != '"') {
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if (c == '\0')
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return -1;
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if (c == '\\') {
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c = *(src++);
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switch (c) {
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case 'a': c = '\a'; break;
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case 'b': c = '\b'; break;
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case 'f': c = '\f'; break;
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case 'n': c = '\n'; break;
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case 't': c = '\t'; break;
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case '\\':
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case '"':
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case '%':
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break;
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case 'x':
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c = 0;
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if (isxdigit(*src))
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c = (c<<4) | xdigit(*(src++));
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if (isxdigit(*src))
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c = (c<<4) | xdigit(*(src++));
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break;
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case '0':
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c = 0;
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if (isdigit(*src) && *src < '8')
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c = (c<<3) | (*(src++) - '0');
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if (isdigit(*src) && *src < '8')
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c = (c<<3) | (*(src++) - '0');
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if (isdigit(*src) && *src < '8')
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c = (c<<3) | (*(src++) - '0');
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break;
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default:
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return -1;
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}
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if (c == 0)
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return -1;
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}
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*(dst++) = c;
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}
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}
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*(dst++) = '\0';
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return 0;
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}
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